html,body{
    width:100%;
    height:100%;
    overflow: hidden;
}
ul,dl,ol{
    list-style: none;
    padding:0;
    margin:0;
}
button:focus{
    outline:none;
}
.angle{
    display:inline-block;
    vertical-align: middle;
    width:0;
    height:0;
    border-top:10px solid #727172;
    border-left:5px solid transparent;
    border-right:5px solid transparent;
    border-bottom:none;
}
.angle.angle-down{
    border-top:10px solid #727172;
    border-left:5px solid transparent;
    border-right:5px solid transparent;
    border-bottom:none;
}
.angle.angle-up{
    border-left:5px solid transparent;
    border-right:5px solid transparent;
    border-bottom:10px solid #727172;
    border-top:none;
}
.angle.angle-left{
    border-top:5px solid transparent;
    border-bottom:5px solid transparent;
    border-right:10px solid #727172;
    border-left:none;
}
.angle.angle-right{
    border-top:5px solid transparent;
    border-left:10px solid #727172;
    border-bottom:5px solid transparent;
    border-right:none;
}